Links:
https://pve.proxmox.com/wiki/Upgrade_from_7_to_8
https://pve.proxmox.com/wiki/Package_Repositories
commands:
sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
apt update && apt dist-upgrade -y
gefunden auf: https://www.youtube.com/watch?v=Ilx3O1HldOA
